diff --git a/src/ShellCheck/Analytics.hs b/src/ShellCheck/Analytics.hs
index 067a53f..3be1077 100644
--- a/src/ShellCheck/Analytics.hs
+++ b/src/ShellCheck/Analytics.hs
@@ -2745,10 +2745,12 @@ prop_checkMaskedReturns2 = verify checkMaskedReturns "declare a=$(false)"
 prop_checkMaskedReturns3 = verify checkMaskedReturns "declare a=\"`false`\""
 prop_checkMaskedReturns4 = verifyNot checkMaskedReturns "declare a; a=$(false)"
 prop_checkMaskedReturns5 = verifyNot checkMaskedReturns "f() { local -r a=$(false); }"
-checkMaskedReturns _ t@(T_SimpleCommand id _ (cmd:rest)) = potentially $ do
+prop_checkMaskedReturns6 = verifyNot checkMaskedReturns "#shellcheck shell=portage\ndeclare a=$(false)"
+checkMaskedReturns params t@(T_SimpleCommand id _ (cmd:rest)) = potentially $ do
     name <- getCommandName t
-    guard $ name `elem` ["declare", "export"]
-        || name == "local" && "r" `notElem` map snd (getAllFlags t)
+    guard $ (name `elem` ["declare", "export"]
+        || name == "local" && "r" `notElem` map snd (getAllFlags t))
+        && (not $ isPortageBuild params)
     return $ mapM_ checkArgs rest
   where
     checkArgs (T_Assignment id _ _ _ word) | any hasReturn $ getWordParts word =